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Share-Based Compensation and Benefit Plans (Stock Option Activity) (Details) - Employee stock option [Member] - Stock option [Member] - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Share-Based Compensation and Benefit Plans |  |  |  |
Compensation expense for share-based compensation | $ 4,557 | $ 4,611 | $ 9,435 | $ 9,119
Income tax benefit from compensation expense for share-based compensation | $ 1,148 | $ 1,146 | $ 2,377 | $ 2,267

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- Definition Amount of tax benefit for recognition of expense of award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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